use crate::entity::data_lineage::ActiveModel as DataLineageActiveModel;
use crate::error::AppError;
use sea_orm::{ActiveModelTrait, DatabaseConnection, Set};

pub struct LineageService {
    pub db: DatabaseConnection,
}

impl LineageService {
    pub fn new(db: DatabaseConnection) -> Self {
        Self { db }
    }

    // Basic lineage implementations
    pub async fn create_lineage(
        &self,
        lineage: crate::models::NewDataLineage,
    ) -> Result<crate::models::DataLineage, AppError> {
        let now = chrono::Utc::now();
        let new_lineage = DataLineageActiveModel {
            child_id: Set(lineage.child_id),
            parent_id: Set(lineage.parent_id),
            relationship_type: Set(lineage.relationship_type),
            confidence: Set(lineage.confidence),
            detection_method: Set(lineage.detection_method),
            description: Set(lineage.description),
            created_by: Set(lineage.created_by),
            created_at: Set(now.naive_utc()),
            updated_at: Set(now.naive_utc()),
            ..Default::default()
        };

        let model = new_lineage.insert(&self.db).await?;
        Ok(crate::models::DataLineage {
            id: model.id,
            child_id: model.child_id,
            parent_id: model.parent_id,
            relationship_type: model.relationship_type,
            confidence: model.confidence,
            detection_method: model.detection_method,
            description: model.description,
            created_by: model.created_by,
            created_at: chrono::DateTime::from_naive_utc_and_offset(model.created_at, chrono::Utc),
            updated_at: chrono::DateTime::from_naive_utc_and_offset(model.updated_at, chrono::Utc),
        })
    }

    // Placeholder implementations for handlers
    pub async fn get_lineage_for_item(
        &self,
        _item_id: i64,
    ) -> Result<crate::models::DataItemWithFullLineage, AppError> {
        Err(AppError::NotImplemented(
            "get_lineage_for_item not implemented yet".to_string(),
        ))
    }

    pub async fn get_lineage_by_id(
        &self,
        _id: i64,
    ) -> Result<Option<crate::models::DataLineageWithDetails>, AppError> {
        Ok(None)
    }

    pub async fn get_suggestion_by_id(
        &self,
        _id: i64,
    ) -> Result<Option<crate::models::LineageSuggestionWithDetails>, AppError> {
        Ok(None)
    }

    pub async fn process_suggestion(
        &self,
        _suggestion_id: i64,
        _action: &str,
        _user_id: i64,
        _relationship_type: Option<String>,
        _description: Option<String>,
    ) -> Result<(), AppError> {
        Ok(())
    }

    pub async fn get_lineage_stats(
        &self,
        _user_id: Option<i64>,
    ) -> Result<crate::models::LineageStats, AppError> {
        Err(AppError::NotImplemented(
            "get_lineage_stats not implemented yet".to_string(),
        ))
    }

    pub async fn generate_lineage_graph(
        &self,
        _center_item_id: Option<i64>,
        _max_depth: i32,
    ) -> Result<crate::models::LineageGraph, AppError> {
        Err(AppError::NotImplemented(
            "generate_lineage_graph not implemented yet".to_string(),
        ))
    }

    pub async fn auto_detect_lineage(
        &self,
        _child_item_id: i64,
    ) -> Result<Vec<crate::models::NewLineageSuggestion>, AppError> {
        Ok(vec![])
    }
}
